<template>
     <!-- 头部部分 -->
    <header class="header">
      <h1>todos</h1>
      <input class="new-todo" placeholder="请输入任务名称" autofocus  @keyup.enter="addList" v-model.trim="todoName"/>
    </header>
</template>
 
<script>
export default {
  name: "TodoListHeader",
  data() {
    return {
      todoName: ''
    }
  },
   methods: {
    addList() {
      if(!this.todoName) return alert('内容不能为空')
      this.$emit('addList', this.todoName)
      this.todoName = ''
    }
   }
};
</script>

<style scoped>
     
</style>